



 
Hi Maria, $120$ inches is $\frac{120}{12} = 10$ feet hence it will take $8$ vertical strips along the long wall and $5$ vertical strips along the short wall. Thus in total you need $8 + 5 + 8 + 5 = 26$ strips, each $12$ feet long. This is a total of $26 \times 12 = 312$ feet which is $\frac{312}{3} = 104$ yards. You will need enough additional material for hems on each strip. Write back if you need additional assistance,  


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